WEEK IN REVIEW: Nicole's Dinner Diplomacy

NICOLE'S MISSION: Nicole Kidman rubbed shoulders Monday night with the newly appointed ambassador to Iraq, John Negroponte, and several other dignitaries at an intimate Manhattan dinner party at the home of Israeli Ambassador to the U.N. Dan Gillerman, PEOPLE reported. Gillerman said Kidman, 36, sat between the Iraqi ambassador and New York Daily News publisher Mort Zuckerman, and "was very interested in ... how he saw his new job – she asked him how he felt about it, about the possible implications of the prisoner photos and how the United States is perceived in Arab world."

WHITNEY WATCH: Whitney Houston is no longer living under the watchful eye of a drug rehab chaperone, PEOPLE reported. "She successfully completed the 30-day treatment program and she is now in an aftercare program, the specific terms of which are confidential," said Houston's Atlanta attorney, Mark Trigg. Houston, 40, entered what was reported to have been a one-month program in early March, but checked out after five days.

SPRAINED CELINE: Celine Dion was forced to cancel her Las Vegas show, A New Day, for the better part of this week because of a sprained neck. "Celine has been instructed by her doctor to rest for five consecutive days," show spokeswoman Kris Lingle said a statement, adding that the six-time Grammy winner, 36, had been performing with a sore neck, which only aggravated her condition. "The doctor has advised that in order for her full recovery, she will be required to remain inactive until the weekend," Lingle added.

50 CENT RAP: Rapper 50 Cent (real name: Curtis Jackson), 37, could face criminal charges following an early Saturday melee that broke out after he jumped into the audience during an impromptu performance at a free concert in Springfield, Mass., PEOPLE reported. Says Springfield Police Captain Bill Noonan: "Some of the people in the band threw some water bottles into the crowd, and the crowd reciprocated and threw some back on the stage. (50 Cent) took off his necklace and jumped into the crowd and was engaged in a physical struggle with several people."

AMERICAN ANDERSON: Pamela Anderson, 36, a native Canadian who broke into showbiz as a pitchwoman for her country's Labatt beer – after she was spotted wearing a Labatt T-shirt at a British Columbia Lions football game – became a U.S. citizen on Wednesday in an L.A. courtroom, Reuters reported. "I felt it was important to become a U.S. citizen in order to vote in the United States," Anderson said in a statement. "U.S. citizenship will allow me, in the future, to petition to bring my children's grandparents down to the United States to care for them once they become older."